<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        div {
            width: 100px;
            height: 100px;
            background-color: springgreen;
            padding: 20px;
            border: 10px solid red;
            margin: 30px;

            /* box-sizing: border-box;怪异盒子模型 */
            /* display: none;    将标签 */
            /* visibility:hidden; */
        }
    </style>
</head>

<body>
    <div></div>
    <script>
        var div = document.querySelector("div")
        /* 获取offsetWidth */
        console.log(div.offsetWidth);
        /* 获取offsetHeight */
        console.log(div.offsetHeight);
    </script>
</body>

</html>